ZHCSDK9A March   2015  – April 2015 TPS22953 , TPS22954

PRODUCTION DATA.  

  1. 1 特性
  2. 2 应用
  3. 3 说明
  4. 4 简化电路原理图
  5. 5 修订历史记录
  6. 6 Device Comparison Table
  7. 7 Pin Configuration and Functions
  8. 8 Specifications
    1. 8.1  Absolute Maximum Ratings
    2. 8.2  ESD Ratings
    3. 8.3  Recommended Operating Conditions
    4. 8.4  Thermal Information
    5. 8.5  Electrical Characteristics
    6. 8.6  Electrical Characteristics, VBIAS = 5 V
    7. 8.7  Electrical Characteristics, VBIAS = 3.3 V
    8. 8.8  Electrical Characteristics, VBIAS = 2.5 V
    9. 8.9  Switching Characteristics, CT = 1000 pF
    10. 8.10 Switching Characteristics, CT = 0 pF
    11. 8.11 Typical DC Characteristics
    12. 8.12 Typical Switching Characteristics
  9. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1 On/Off Control (EN pin)
      2. 9.3.2 Voltage Monitoring (SNS pin)
      3. 9.3.3 Power Good (PG Pin)
      4. 9.3.4 Supervisor Fault Detection and Automatic Restart
      5. 9.3.5 Manual Restart
      6. 9.3.6 Thermal Shutdown
      7. 9.3.7 Quick Output Discharge (QOD) (TPS22954 Only)
      8. 9.3.8 VIN and VBIAS Voltage Range
      9. 9.3.9 Adjustable Rise Time (CT pin)
    4. 9.4 Device Functional Modes
  10. 10Application and Implementation
    1. 10.1 Application Information
      1. 10.1.1 Input to OutputVoltage Drop
      2. 10.1.2 Thermal Considerations
      3. 10.1.3 Automatic Power Sequencing
      4. 10.1.4 Monitoring a Downstream Voltage
        1. 10.1.4.1 Monitoring the Input Voltage
    2. 10.2 Typical Application
      1. 10.2.1 Design Requirements
      2. 10.2.2 Detailed Design Procedure
        1. 10.2.2.1 Inrush Current
      3. 10.2.3 Application Curves
  11. 11Power Supply Recommendations
  12. 12Layout
    1. 12.1 Layout Guidelines
    2. 12.2 Layout Example
  13. 13器件和文档支持
    1. 13.1 相关链接
    2. 13.2 商标
    3. 13.3 静电放电警告
    4. 13.4 术语表
  14. 14机械封装和可订购信息

封装选项

机械数据 (封装 | 引脚)
散热焊盘机械数据 (封装 | 引脚)
订购信息

11 Power Supply Recommendations

The device is designed to operate from a VBIAS range of 2.5V to 5.7V and a VIN range of 0.7 V to 5.7 V.  The power supply should be well regulated and placed as close to the device terminals as possible. It must be able to withstand all transient and load current steps. In most situations, using an input capacitance of 1 µF is sufficient to prevent the supply voltage from dipping when the switch is turned on.  In cases where the power supply is slow to respond to a large transient current or large load current step, additional bulk capacitance may be required on the input.

The requirements for larger input capacitance can be mitigated by adding additional capacitance to the CT pin. This will cause the load switch to turn on more slowly. Not only will this reduce transient inrush current, but it will also give the power supply more time to respond to the load current step.